Malicious PDF — malware analysis report

Static analysis result for SHA-256 46482955a14d4fb8…

MALICIOUS

PDF

76.0 KB Created: 2021-04-22 08:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c6918a36ad9bbeeec1af44e44108a82 SHA-1: 7a3755982511dd7557a6fb7aca9de35db192d826 SHA-256: 46482955a14d4fb8c9dc3c06461f96baf813c0bf564b9a6e5ddf515f0812aa08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that aligns with the PDF_URI heuristic, suggesting it's designed to redirect users to a malicious site. The presence of numerous external links, many on disposable hosting, further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/strik?utm_term=random+crossfit+wod+generator PDF link annotation
    • http://gakukuketisalum.scienceontheweb.net/62438199751.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/kodopifidofik-pimulidubu-wupanusojubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_60613567c9a4b.pdfIn PDF document text
    • http://vodizurulenega.mypressonline.com/gawitiwubiwonaniponaw.pdfIn PDF document text
    • http://pozezan.mygamesonline.org/saravufetojidorugelip.pdfIn PDF document text
    • http://tapodozinojet.mypressonline.com/estudio_biblico_sobre_el_bautismo_en_agua.pdfIn PDF document text
    • http://guzanarogenuje.iblogger.org/xorofifigikukoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388293/normal_600b40607b3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459027/normal_606c7ea423d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_603c1e13c5bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476436/normal_6069d79fdf1f8.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/1cb1349.pdfIn PDF document text
    • http://tikewifijub.22web.org/jezudisanupuwoxur.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/philips_smartsleep_hf3520_60_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikijanux.atwebpages.com/what_is_binomial_theorem_in_discrete_mathematics.pdfIn PDF document text
    • http://magovinirubow.epizy.com/clone_hero_rock_band_4_guitar_ps4.pdfIn PDF document text
    • http://jibimom.myartsonline.com/mibewobuxurenajofifi.pdfIn PDF document text
    • http://lanakupi.epizy.com/time_travelers_wife_differences_between_book_and_movie.pdfIn PDF document text
    • http://bizimefinuwonij.rf.gd/20491922175.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 5408 bytes
SHA-256: 41a0c76f9812a0aeddf77dbf65fcc8976fdc88c3a40657d3bc35162cb6b8bf7d
font_01_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10996 bytes
SHA-256: e86d49474cf73f7e7cee17c19237bfa65f8222e93806d1d858b803a581924875

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